It does work though, you just have to use j.6c. There are some combos that I've seen Rion do that I couldn't replicate with a regular 6c, so I had a suspicion for whatever reason that a j.6c would come out faster and it did. It's gotta be instant air j.6c though.
I'm sorry I quoted the wrong combo. This is the one I'm having trouble with because the 6c seems to have to be j.6c:
Corner : 5A (anti air) > jA > jC > jB > 2C > 214 C > j6C > j236B > j214A > 214BB4 > 44 > j214A > 6C